Re: [R] overdispersion and quasibinomial model

2009-11-25 Thread Peter Ehlers
djpren wrote: Thanks for the reply. Naturally I already searched the site and help for the answers to these questions. I think I've figured out how to run a quasi-binomial model, but I cannot figure out how to test for over-dispersion or how to apply a shapiro-wilk test. This is not homework,

Re: [R] overdispersion and quasibinomial model

2009-11-25 Thread David Winsemius
On Nov 25, 2009, at 7:04 AM, djpren wrote: Thanks for the reply. Naturally I already searched the site and help for the answers to these questions. I think I've figured out how to run a quasi-binomial model, but I cannot figure out how to test for over-dispersion or how to apply a shapiro-w

Re: [R] overdispersion and quasibinomial model

2009-11-25 Thread djpren
Thanks for the reply. Naturally I already searched the site and help for the answers to these questions. I think I've figured out how to run a quasi-binomial model, but I cannot figure out how to test for over-dispersion or how to apply a shapiro-wilk test. This is not homework, neither do I have

Re: [R] overdispersion and quasibinomial model

2009-11-25 Thread Ben Bolker
djpren wrote: > > Thanks for the reply. Naturally I already searched the site and help for > the answers to these questions. I think I've figured out how to run a > quasi-binomial model, but I cannot figure out how to test for > over-dispersion or how to apply a shapiro-wilk test. > > This is

Re: [R] overdispersion and quasibinomial model

2009-11-24 Thread David Winsemius
On Nov 24, 2009, at 3:41 PM, djpren wrote: I am looking for the correct commands to do the following things: 1. I have a binomial logistic regression model and i want to test for overdispersion. Under the teach a man to fish precept, ... try: RSiteSearch("test over dispersion binomial mo

[R] overdispersion and quasibinomial model

2009-11-24 Thread djpren
I am looking for the correct commands to do the following things: 1. I have a binomial logistic regression model and i want to test for overdispersion. 2. If I do indeed have overdispersion i need to then run a quasi-binomial model, but I'm not sure of the command. 3. I can get the residuals of t